Care should be taken to ensure that WHITPLAST PUTTY is thoroughly mixed. Mix in a suitable size container using an approved spiral paddle attached to a slow speed (400/500rpm) heavy-duty drill. Place 4.8 - 5.1 litres of cool, clean drinking quality water in the mixing container followed by the powder and mix thoroughly. Small quantities can be hand mixed by blending 2.5 - 3 parts powder to 1 part by volume of cool, clean, drinking water.